Today Google announced an improved version of CAPTCHA it’s called ‘NoCAPTCHA reCAPTCHA’.
“Tough on bots
Easy on humans”
Google says reCAPTCHA is easy to add, advanced security. reCAPTCHA is a free service that protects your site from spam and abuse. It uses advanced risk analysis techniques to tell humans and bots apart. With the new API, a significant number of your valid human users will pass the reCAPTCHA challenge without having to solve a CAPTCHA. reCAPTCHA comes in the form of a widget that you can easily add to your blog, forum, registration form, etc.
If the nocaptcha think you are a human, then you’re done no more steps. If it thinks you are a bot, then you need to do the traditional captcha method or the advanced one like choosing the right image from a series.
Create your reCAPTCHA here